Mercenary Bug Skill use

Please help check my account. Due to a skill bug I am unable to continue playing this game. If there is a reply for support, I will be very happy because I really am at my wits' end.
This is what I uploaded.

https://www.youtube.com/watch?v=zi4xgGQw4_Q

Help me pls.

https://pic.in.th/image/wh-bug.3srBuW
https://pic.in.th/image/wh-bug1.3srHvK